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Dev and Ops Collaboration and Awareness at Etsy and Flickr
Coming Together Ops = good
with tcpdump and strace. Those tools suck for app-level troubleshooting. Answer! Dev can make those things for the application.
?ioproﬁler=1 like tcpdump/strace, but for
etsy.com [dbshard01] 0.902 ms SELECT count(*) FROM FavoriteListingUser WHERE listing_id = 5773453 [memcache] 0.361 ms Cache HIT, keys: Etsy_Cache_Results:c812331f123321:1121231
Coming Together Dev is good
with application behavior, but might not know how to surface it. Answer! Ops can provide a platform for tracking and graphing, make it it brain-dead simple to add new metrics and collection methods.
Logging web0022 10.20.30.40 [02/Nov/2010:17:56:00 +0000]
"GET /listing/60129005/live-simply-original-triptych-painting?ref=fp_ph_2&src=favitm HTTP/1.1" 200 9171 "http:// www.etsy.com/" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:22.214.171.124) Gecko/20101026 Firefox/3.6.12" - 6;12;14;15;18;22;23;35;37;44;47;51 0;0;0;0;0;0;1;0;1;2;0;1 5020244 8912896 373846 842158 Done, via apache_note() in PHP: 6;12;14;15;18;22;23;35;37;44;47;51 = test IDs for our A/B testing framework 0;0;0;0;0;0;1;0;1;2;0;1 = variations within the A/B tests 5020244 = the etsy user ID. (if it’s a logged-in request) 8912896 = the amount of memory (bytes) PHP used in serving the request 373846 = the time, in microseconds, PHP spent generating the response 842158 = the time, in microseconds, for Apache to send the response
Search Logging search02 2010-11-03 12:53:02,668
[pool-26-thread-209] INFO solr.SolrListingsv2Search - listingsv2.search: execTime=40, listings query=laptop bag “execTime=40” - search time, in milliseconds Query rates, average latency, and 95th percentile
Coming Together Ops need to
have graceful degradation options for fault-tolerance within the application. Answer! Developers can instrument the code with conﬁg ﬂags.
Feature Flags • Turn on/oﬀ
core functionalities via conﬁg ﬂags • Reviewed by product, ordered by priority • “Branching in Code” - dark/staﬀ/percentage/etc. More info here: http://code.ﬂickr.com/blog/2009/12/02/ﬂipping-out/ http://www.paulhammond.org/2010/06/trunk/alwaysshiptrunk.pdf
Trust & Responsibility • Devs
own their own code, so they expect 24x7 contact on it • When things break, dev and ops both participate • Post-Mortems have both dev and ops remediations
Trust & Culture • No
ﬁngerpointy-ness allowed. None. • Trust in the team, lean on each other’s experiences and perspectives • New feature launch coordination (Go or NoGo) • Designated Ops for Dev teams, early involvement
No Asshole Rule • Allowing
snarky, biting, and defensive comments between Dev and Ops is implicitly encouraging contention. So: don’t. • BOFH: You know that guy. Don’t be that guy. • Condescension, holier-than-thou communication limits your career.
When It Works Tools, Code,
and Process when you have this... 30% ...this part becomes easy and a lot more 70% fun Culture and Communication
@ Etsy • Sharing and
access is the rule, not the exception. • Ops are not “gatekeepers”, they aim to be enablers. • Devs are not “abstracted” from the infrastructure guts, they aim to be in it. • “We” is the norm, not “us” and “they”